a |
3 |
b |
1 |
2 |
| ||
2 |
a |
b |
a |
b |
a |
b |
a |
3 |
b |
1 |
2 |
| ||
2 |
3 |
1 |
2 |
| ||
2 |
a |
b |
x |
t2+2
| ||
2 |
| ||||
2 |
y |
1 |
2 |
3 |
| ||
2 |
x |
y |
x |
y |
t2+2
| ||
2 |
1 |
2 |
3 |
| ||||
2 |
| ||
2 |
1 |
4 |
3 |
4 |
1 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
m |
n |
m |
n |
b |
a |
a |
2 |
A.(-∞,0) | B.(0,2) | C.(2,+∞) | D.(-∞,0)∪(2,+∞) |
A.a∈(-∞,3] | B.a∈(-∞,9] | C.a∈(-1,∞) | D.a∈(-∞,3) |
© 2017-2019 超级试练试题库,All Rights Reserved.